Chapter 20 Components

Question 1

Define demarcation point (DP)
as it relates to
residential cabling.

Answer 1

The point of interface between the
access provider (AP) and the owner
of homes, MDUs, and campuses
TDMM: Page 20-4

Question 2

Where is the DP typically
located in a
single-family residence?

Answer 2

On the outside of an exterior
building wall
TDMM: Page 20-4

Question 3

Name the 4 types
recommended backbone cable
for residential cabling
systems.

Answer 3

1. 100-ohm balanced twisted-pair
2. Multimode optical fiber
3. Singlemode optical fiber
4. Trunk, feeder, and distribution
   coaxial cable
   TDMM: Page 20-5

Question 4

Name 3 topologies that may
be used to deploy coaxial
backbone cable in a residential
cabling system.

Answer 4

1. Star topology
2. Bus topology
3. Star and bus topology
   TDMM: Page 20-5

Question 5

Name 3 topologies that
may be used to deploy optical
fiber cable in a residential
cabling system.

Answer 5

1. Star topology
2. Ring topology
3. Bus topology
   TDMM: Page 20-5

Question 6

Where does the
ADO cable reside?

Answer 6

In the distribution device (DD)
TDMM: Page 20-5

Question 7

How many 4-pair cables must
a balanced-twisted pair ADO
cable accommodate?

Answer 7

A minimum of 2 per living unit
to provide for telephone,
data and security.
TDMM: Page 20-5

Question 8

What determines the proper
number of pairs required for
an ADO cable?

Answer 8

The tenant’s needs
TDMM: Page 20-5

Question 9

What type of coaxial cable
should be used for a
coaxial ADO cable?

Answer 9

Series-6
TDMM: Page 20-6

Question 10

How many coaxial cables
must an ADO cable
accommodate?

Answer 10

A minimum of 2 per living unit.
TDMM: Page 20-6

Question 11

Name 2 functions of an ADO.

Answer 11

1. Provides a means for the tenant
   to disconnect from an AP
2. Provides terminations for
   connection to the premises
   cabling
   TDMM: Page 20-6

Question 12

How many balanced twisted-
pairs should be included in the
design of an ADO?

Answer 12

A minimum of two (2)
TDMM: Page 20-6

Question 13

How many coaxial cables
should be included in the
design of an ADO?

Answer 13

A minimum of 2
TDMM: Page

Question 14

How many optical fiber
strands should be included in
the design of an ADO?

Answer 14

2
TDMM: Page 20-6

Question 15

Is the garage of
a single-family home a
permissible location
for the DD?

Answer 15

Only if the space is conditioned (i.e.,
preventing excessive temperature
and humidity) and accessible for
cabling maintenance.
TDMM: Page 20-7

Question 16

Define distribution device (DD)
as it relates to a residential
telecommunications system.

Answer 16

A facility that is used for the
termination and connection of outlet
cables, distribution device (DD)
cords, equipment cords and in some
cases, auxiliary disconnect outlet
(ADO) cables
TDMM: Page 20-7

Question 17

What are the distance
requirements for providing
access to the building
electrical ground?

Answer 17

*Within zl .52 m (5 ft) of the DD
*In accordance with applicable codes
TDMM: Page 20-7

Question 18

Name 2 factors used to
allocate wall space for a
distribution device in a
residential system.

Answer 18

1. Grade of service
2. Number of telecommunications
   outlet/connectors to be installed
   TDMM: Page 20-7

Question 19

How many cable runs should
be included in the design of a
distribution device?

Answer 19

20 to 50 percent more cable runs
than the original installed
number of runs
TDMM: Page 20-7

Question 20

What is the distance
requirement between the
dedicated duplex electrical
outlet and the DD?

Answer 20

The outlet must be installed within
-1.52 m (5 ft) of the DD.
TDMM: Page 20-8

Question 21

What type of electrical outlet
must be included in the
DD to accommodate
fiber-to-the-home?

Answer 21

A dedicated 1 5-A, 120 Vac nominal,
nonswitchable duplex
electrical outlet
TDMM: Page 20-8

Question 22

How many outlet cable runs
extend from the DD to each
telecommunications outlet?

Answer 22

1 or more
TDMM: Page 20-9

Question 23

What category of balanced
twisted-pair cable is
recommended for
telecommunications outlet
cable in a residential system?

Answer 23

Category 6 or better
(4-Pair 100-ohm).
NOTE: ANSI/TIA requires
category 6A.
TDMM: Page 20-9

Question 24

When are weather-resistant
telecommunications outlets
required?

Answer 24

When they will be installed on
building exteriors when installed
on building exteriors or in areas
that may be wet or damp
(e.g., unfinished basements,
garages, laundry rooms).
TDMM: Page 20-11

Question 25

How many T568A connectors does a Grade 1 telecommunications outlet contain?

Answer 25

1 TDMM: Page 20-10, Table 20.3

Question 26

How many F connectors does a Grade I telecommunications outlet contain?

Answer 26

1 TDMM: Page 20-10, Table 20.3

Question 27

How many T568A connectors does a Grade 2 telecommunications outlet contain?

Answer 27

2 TDMM: Page 20-10, Table 20.3

Question 28

What components may be housed in the CER when it is collocated in the EF?

Answer 28

*Active equipment *Terminations for the DP, ADO cable, and backbone cable TDMM: Page 20-12

Question 29

Where do backbone and ADO cables terminate in a multi- dwelling building?

Answer 29

In the common telecommunications room (CT R) TDMM: Page 20-12

Question 30

Where should the CTR be located?

Answer 30

On each floor OR every third floor (Thus, serving the floor it is on and the floors above and below) TDMM: Page 20-12

Question 31

What is the minimum space required for a Grade 2 CTR in an MDU with up to five tenant units?

Answer 31

-775 mm (30.5 in) wide x 0 mm (24 in) high TDMM: Page 20-12, Table 20.4

Question 32

What is the minimum space required for a Grade I CTR in an MDU with up to five units?

Answer 32

-368 mm (14.5 in) wide X 0 mm (24 in) high TDMM: Page 20-12, Table 20.4

Question 33

What is the minimum additional space per tenant unit required in a Grade I CTR in an MDU with more than five units?

Answer 33

-32,258 mm2 (50 in2) TDMM: Page 20-12, Table 20.4

Question 34

What is the minimum additional space per tenant unit required in a Grade 2 CTR in an MDU with more than five units?

Answer 34

64,516 mm2 (100 in2) TDMM: Page 20-12, Table 20.4